AS-Interface Analyser
Using the Analyser
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Subject to reasonable modifications due to technical advances.
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7
Using the Analyser
The analyser can be used for many different tasks. The most important functions
are described in the following sections.
7.1
Checking the actual state
The online statistics permit the complete examination and logging of the momen-
tary condition of an attached net. It can be improved step by step:
• The "Overview" of the online statistics gives a direct visual impression of the of
the net's quality by the classical traffic light representation "green" – "yellow" –
"red" (example in fig. 3). It verifies the period between power-on of the analyser
(or a deleting process) and the read-out. During this period the worst condition
of a slave (red or yellow) is indicated. This mode is a basic mode of the analyser.
It is appropriate for long-term verifications. The notebook needs to be attached
for analysis only (up to measurement periods of 14 days).
• The "Advanced Statistics" give detailed results. They show the number of mas-
ter calls to each slave during the observation time. It shows the number of rep-
etitions also which were necessary due to incorrect or missing telegrams and in
addition cycle time and voltage in the net (example in fig. 4).
• The "Consecutive Error" split up the errors into simple and multiple errors and
so it permits a qualified evaluation of the observed repetitions. Compare chapter
3 and fig. 5.
• The configuration which the analyser provides is based on net data therefore, it
corresponds to the slaves actually found in the net. At the same time it is recog-
nized which slave types are present to which the master does not respond in the
protected mode, or whether an individual slave does not correspond to the con-
figuration stored in the master.
With these analysis steps the attached net is described almost completely. The
user receives:
• An overview of all attached slaves (addresses, profiles),
• an overview of the ability to communicate of each individual slave,
• a basis for evaluation deviations from the ideal situation,
• a means to control the effect of an AS-i bus termination or an AS-i tuner or for
other measures which concern the net or individual slaves,
• an analysis of the long-term stability of a net.
So these deviations from the nominal condition can be eliminated.
7.2
Logging the Actual State
The protocol of the online statistics can be stored and printed out. It covers the
points mentioned in the chapter before and it can be manually supplemented by a
description of facility. This description contains for example the type numbers, the
manufacturers or detailed data of the used components. So the actual state of the
net is precisely documented.
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